| Listed in parts books | Not catalogued by year yet |
1 1/8 MONOBLOC CARB 389 - 28mm - Jetting 300 main, 106 needle, #3 slide, #20 pilot
Amal Monobloc 1 1/8 in. (28mm) carburetor, body 389, jetted with a 300 main, 106 needle, #3 slide, and #20 pilot.
This is a complete Amal Monobloc carburetor, the 389 body in the 1 1/8 inch (28mm) size. It's built up with the factory jetting called for on this variant: a 300 main jet, 106 needle, number 3 slide, and number 20 pilot jet.
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The Monobloc was the mainstay Amal design fitted across a long run of British twins before the Concentric took over, and this larger bore size shows up on the bigger-running setups. If you're rebuilding a bike that came with a 389-series carb, matching the body size and jetting here matters — swapping in the wrong needle or main jet changes how the bike runs at every part of the throttle.
We don't have this one tied to a specific model in our records, so before you order, check what your bike's parts book calls for and confirm the 389/18 is the right body and jetting combination for your application.
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